Attachment for sewing machines



July 14, 1925. 1,546,229

H GROSSMANN ET AL ATTACHMENT FOR SEWING MACHINES Filed Nov. 12, 1923Patented July 14, 1925.

PA TENTI'I -o FF-IC'E.

HERMANN GROSSMANN AND ALEXANDER GRossMA-Niv, or, nansnnn, GERMANY.

ATTACHMENT ro-R SEWING MACHINES.

Application filed November 12, 1923. Serial No. 674,379.

To all whom it may concern Be it known that we, HERMANN Gnoss- MANN andALEX NDER GROssMANN, citizens of Germany, residing at Dresden, Germany,have invented certain new and useful Improvements in Attachments forSewing Ma- 'chines, of which the following is a specific-a- 't'ion.

Our invention refers to an attachment for sewing "machines, and moreespecially for flower stitch sewing machines for use in theinianufacture of straw hats and the like. Its gparticular object is toimprove that part of the mechanism which comprises the guide which inknown machines of this kind is sideways adjustable and carries themember for holding the work piece down on the table, as well as a memberserving to guide the strip consisting of plaited work or the like whichshall be sewed onto the straw hat, T

this member serving also to separate the strip from the work piece. g Inthe attachment for sewing machines according to the present invention,this guidstead of a strip of uniformwidth, so-called mg and separatingmember is arranged to be lisplaced sideways in order to insure a uniformwidth of the stitches, both at the work piece and the strip to beconnected therewith. This novel strip guide further allows keeplng itsposition also in" the case where,in-

inserts shall be sewed on, if the hat'shall be broader on one sidethanon the other. Ac-

cording to the present invention, the dc:

pressing member disposed between the strip guide and the left hand endface of the guide is arranged to be removed in order to allow exchangingit, and can be made to swing upwards, the pressure exerted by ituponthestrip being variable.

This and further improvements are more fully described hereinafter andillustrated in v the accompanying drawings forming part ofthisspecification and illustrating an at 'tachment of the kind aforesaidembodying my invention by way of example.

drawings Figure 1 is an elevation partly'in vertical Figure 2 isan endelevation,

' portion of the attachment.

'p ably moimte d way of the sewing of the ways under the action themachine during-the sewing. f The. strip sleeve the teethofrod-l4and'prevents it from shaking and from-any undesirable movep into acircumferential Figure 3 is a rear view of the'left hand machine, asusual. 44 is the member which serves for holding the work piece appliedto the table or needle plate, this member belng arranged .for lateraldisplacement and adjustment. 7 In the concave rear surface 2 guide alongitudinal boring 3 is provided surrounding a rack 4 which can bedisplaced by means of the toothed cylindrical portion 50f the spindle 6which meshes with the rack 4 and can be 0 erated by means of the head 7The free en of the rack 4 carries the scythe-shaped strip guide .8. Ascrew 10 projecting into the annular groove 9 of the pindle 6 preventsthis latter from being withdrawn from its seat. The portion of the screw10 which projects into the groove 9 does not fill the entire width ofthe groove, thus allowing the spindle 6 to be shifted longitudinally tosome extent. he coil spring 11 inserted between the head 7 andguideltends to press the head outwards, whereby the lower edge of groove9 is pressed against the screw 10, thus preventing the rack4 from'beingfdisplaced sideof theshocks acting on guide 8 is thus arranged tobe correctlyadjusted with regard to the needle, in order to insure auniform width of stitch. a

The arm 13.disposedbetween thev strip guide 8 and the left hand endplate12 ofithe guide 1 and which serves to keep the striYi appliedagainst the needle 'plateis bento? atright angle-s froin a toothed rod14 f quadrangular section. ,This rod is dis ose in the quadrangularopening 15 of-a sleeve 16 located'inthe cylindrical boring of theprojecting portion 18 of the guide. The spring 19 fixedv tothe innerwallof the projects with slight pressure. between ments relatively tosleeve 16. without, however, preventing it from being removed for L,the'purposeof replacing it. .On rod 14 being In the of spring 19 causesit to recede into an: in-

. denture 43 provided in the wall of sleeve 16.

wlthdrawmthe teeth acting on the free end A threaded pin 21 projectingfrom below groove 20 of sleeve 16 prevents this latter from .beingdisplaced laterally, while allowing it to turnabout its longitudinalaxis. As thisturning movement extends only over part of a circle,,thegroove 20, does not extend. entirely around thesleeve,

To the rig'ht; ofithe bearing 18 a'i'fl anged disc 22 is located onsleeve 16', this disc sur.

portion 25 of the handle 26 is" screwed. In

I the hollow 27 of thishandlea.eoilaspring 28 is V, inserted, whichserves for; pressing a .pin

29 into a narrow, notch 3010f theipart 23.

' "sleeve 31 is-located on the bush 16 one "side of the disc 22, anddnthe lett handportion'32 otjsleevefil there is disposeda clock ispring33having one endinserted in. sleeve 116 Wllll the other endv projectsinto a; lateralindenturefi i of bush 31. lhe;bush 31 isjturtherjprovidedwith severalindentures 1.36 corresponding to the projection241 on the 2pa t'2 ig; 5)

7 there is'disposeda .coil' spring 3 Sur unding e e. 6, .0116; d t

Qspring r fstingagainst a ring 40 .fiXed on the Z rightfhandendof.sleeve 16-by means of a ,'screW 39, his spring serving to presssleeve l 31 against, the piece 22 the pressure exerted jby'thespring"being controlled ,by the position 'of ring 10. 'flhe springpressurecan thus be regulated in order to safeguardoooperation betweenprojection 24 inden tures 36 under all circumstancesand al- 1 thoughtheispring tension might decrease.

If 'sleeve gi ql is .pulled to the right against I the action ofspring38, it will pass across rin'gtOand will release the projection241, be-

ing n'ow freeto be turned about sleeve 16 by itself, in. order toi placeanother ind'enture 36 opposite]projectiong24 whereby the tension ofspring 33 and with. it the pressure 4Q. exerted by the member sewed onislessened or increased.

- i In ordf r to cause'the, member upwards, the

) 13: to swing a handle 26; is pressed dowmjthe pin 29 leaving. notch30. further turne5 "ing the'disc'22 which carniessleeve 31 along-withit, spring ,33 is placed 11116161 tension until} it Torres .sleeve1:16 ,i to partake in the 'ffi lfni i' "foil .31. whe e y. s od .1 is

' tnrned about its longitudinal axis, carr-ying far 13 into fth e jposition shown]: in dotted lines Whil'e the parF .QI'Q in this p.osition ,fthe pressure eitertedby pin 29 upon -bearing 18 prevents. anyuunjdesirable jdis 5 p-lacementfof the "parts. Then handle 26 is movedhack, sleeve-'16 will be turned back I ,also together with {disc 22 and{bush 31, whereby,-1 "a"'r m"13 jis causedto apply itself against thestrip to be sewed o Byhandle 6o 'ggibeing swung black g'tu'rther untilits }pin 7 29 again enters .notch 30, the predetermined ,"pre f n exrted 9 i by. spring-I 33 i mam Rain d; i .f :1;

he upper portion 1 "of "the guide which supports the members 8 andl3"ispivoted to In the right ,hand portion 1'3 onthe stripto be the base42 'displaceably mounted on the machine by means of a vertical bolt 41and can thus be swung around in a horizontal 1 plane in thedirection"towards the operator.

, In .view of the fact that the strip to be sewed on 'extends'across theguide rod 4, the upper portion 1 .cannot...be swung upwards, as informer machines.

We wish it to beunderstood. thatwe do v,notidesire to be limited' to theexacti details of construction shown and described, for bviousmodifications will occurtoaperson skilledin'the art. 7 'l/Veclaim: pp

1.. Attachment ntor sewing machinesrcomprising a guide, isaid guide,aplate on the outer end. of said rack, :means for displacing. saidIrack, a lsleeve .rotatably .oarriediin said :guide. and Xtending inparallel with said rack,,means for vrotatingi said sleeve, a..bar heldagainst ,rotation in.:.s aid sleeveiand adaptedto slide therein; and anarm at theouter end ot said har. J i r Attachment forsewingmachinescomprising a guide,.a Iackadapted to slide in 'said guide,aflplate on thev outer. end 0t said racln. a pinion rotatably. harriedin said ,guide iandadapted. to, mesh with said. rack, means for rotatingsaid. pinion, a sleeve. .rotatably carried in ,sa i,l "guns. and,.extending in :para-llel .Withsaid racli', .1neans. torlr'otating said.sleeve, -a bar held against. rotation in said sleeve and adapted ,to,slide therein anol an arm at; the" outer'endiof said bar,

3. Attachment tori, sewing machines comprising-.-a 'gi'1ide,-a,rackadapted to slide in s'aid'guide, spin onlthe outer end ofsaid rack, apinion adapted to mesh with .said

rack, a spindle secured to said pinion, said spindle being rotatablycarried and'adapted ;to slide, in said guide, a. shoulder. on saidspindle, a pin 1n said .guide, adaptedto. en-

gage shouldenia{spring adapted-to ex- 6 ft aXial pressure on saidspindle 'so ia s to hold said sh'oulderiagainst' salifdppinfa sleeverotatably carried in said guide andi exteinding in parallel with saidrack, means for rotating, said sleeve, a bar held against ram 1 tion inssaid sleeve and adapted to; slide 'therein, and anarm-at the out'erenfd ofgsaid 4. :Attachrnent 'for sewing inachines com- ;prisingi aguide, a eak 7 adapted v to slide in said guide, a plate on theouterentl of said rack, means fordisplacing said rack, a sleeve rotatably carried tin said, guide and extending in parallel witl said rackmeans for rotating said sleeve, abar; ot polygonal cross sectionadaptedjto slide iinf a corresponding hole in said sleeve, an arises thev, outerr end of said'b'ar; 'a bush having notches jat'itsinner eiidandrotatablycarried on said i sleeve, a spiral springgresilientlyconnecting said Sleeve sateen 'bu'shja magazines till a rack adapted toslide in a rotatably carried on said sleeve, means for rotating saiddisc and for temporarily securing said disc against rotation relativelyto said guide, and a tooth on said disc adapted to engage one of thenotches at the end of said bush.

5. Attachment for sewing machines comprising a guide, a rack adapted toslide in said guide, a plate on the outer end of said rack, means fordisplacing said rack, a sleeve rotatably carried in said guide andextending parallel with said rack, means for rotating said sleeve, a barof polygonal cross section adapted to slide in a corresponding hole insaid sleeve, an arm at the outer end *of said bar, a bush having notchesat its inner end and rotatably carried on said sleeve, a spiral springresiliently connecting said sleeve with said bush, a flanged discrotatably carried on said sleeve, a handle secured to said disc, aspring-actuated looking pin in said handle adapted to engage a recess insaid guide, and a tooth onsaid disc adapted to engage one or the othernotch at the end of said bush.

6. Attachment for sewing machine comprising a guide, a rack adapted toslide in said guide, a plate on the outer end of said rack, means fordisplacing said rack, a sleeve rotatably carried in said guide andextending in parallel with said rack, means for rotating said sleeve, abar of polygonal cross section adapted to slide in a corresponding 'holein said sleeve, an arm at the outer end of said bar, a bush havingnotches at its inner end and rot-atably carried on said sleeve, a spiralspring resiliently connecting said sleeve with said bush, a flanged discrotatably carried on said sleeve, means for rotating said disc and fortemporarily securing said disc against rotation relatively to saidguide, a tooth on said disc adapted to' engage one or the other notch atthe end of said bush, a coiled spring tending to force said bush againstsaid tooth, and means for varying the tension of said spring.

In testimony whereof We aflix our signatures.

HERMANN GROSSMANN. ALEXANDER GROSSMAN N.

